Sealing method for laser glass

Abstract

A sealing method for a laser glass which provides a high bonding strength comprising applying a powder mixture of (1) a low melting glass for sealing a glass laser and (2) a glass having a higher melting point and lower expansion coefficient than those of the low melting glass, to a laser glass and welding the powder mixture to the laser glass by heating.

What is claimed is: 
     
       1. A sealing method for a laser glass which comprises applying a powder mixture consisting essentially of (1) a low melting glass for sealing a glass laser and (2) a glass having a melting point higher than the melting point of the low melting glass and an expansion coefficient lower than the expansion coefficient of the low melting glass to an Nd laser glass and welding the glass mixture to the laser glass by heating. 
     
     
       2. The sealing method of claim 1, wherein the proportion by weight of the low melting glass to the high melting glass ranges from about 98:2 to 50:50. 
     
     
       3. The sealing method of claim 1, wherein the welding of the glass mixture to the laser glass is by heating to a temperature of from about 400° to 600°C. 
     
     
       4. The sealing method of claim 1, wherein the particles of the powder mixture have a size of not above 100 microns. 
     
     
       5. The sealing method of claim 1, wherein said low melting glass comprises a B 2  O 3  --Tl 2  O--ZnO or a B 2  O 3  --PbO--ZnO glass. 
     
     
       6. The sealing method of claim 1 wherein the expansion coefficient of the sealing glass after said welding, is a value substantially the same as or lower than the expansion coefficient of the laser glass.